i also went thru the same problems with my fiberglass trunk lid. i also found pockets under the gel coating. had to go all over with a scratch awl and pick out the pockets, some 1 1/2 " long and sand the cavities and fill with duraglass filler. found it to be the same with my side scoops. i am leary of painting , so i may leave in epoxy primer for a while.